PHP Paypal API class

* More consistent return value from 'getCheckoutUrl()' in case required parameters are omitted.

* More consistent return value from 'getCheckoutUrl()' in case required parameters are omitted.

* Added credit-card parameters for updating recurring payment profiles created using direct payments

* Added credit-card parameters for updating recurring payment profiles created using direct payments

* Removed sensitive credit-card data from the log. Update if you use the component logging capabilities with the Direct Payment method

Bundle release that includes the Maxmind Minfraud component for detecting possible fraud attempts. See - http://www.binpress.com/app/maxmind-minfraud-api-wrapper/1058

Please read the following changes carefully before updating:

* Default location of certificate file changed from '/Paypal' to '/Cert'. In addition, you can now control the path to the certificate file through the class member $_SSLcertificate

* Added the option for authenticating using a Paypal certificate instead of the signature. Read the documentation or README file for more details.

* Added examples for integrating with the newly released Maxmind Minfraud component for detecting fraud attempts. Examples modified are the Express Checkout (in the 'confirm.php' file) and the Direct Payment (in the 'direct.php'). Note that you can upgrade your current license to get access to the download that includes the Minfraud component.

* Addresses issue with multiple items with tax resulting in "cart items amounts do no match error

* More automated calculations - shipping, handling, tax and insurance now handled automatically if amounts not present. This change addresses a recent theme with people having trouble getting the amounts consistent across calls.

* An array of additional parameters can now be passed as the second argument to the log() function, for logging purposes. Use it if you want to record additional data not related to the paypal transaction

* Added a few parameters
* Separated express checkout specific parameters into own array, removed $_noprefix list

* Minor fix to Email parameter introduced in version 1.2

* Refactored getCheckoutToken() and confirmCheckoutPayments() to use the same parameter array. This allows item details to appear in the confirmation Emails sent to the buyer and seller (Thanks Dave Cohen!)
* Added shipping information fields to both Express Checkout and Direct Payment methods. See field keys in the $_paymentOptions array if you intend on passing it.
* Some minor additional refactoring

* Added log() call to confirmIpn()

* Minor typo correction

* Fixed parameter category misspelling

* Slight update to direct payment example

Simplified recurring profile generation with Express Checkout, see examples for more details.

* Added 'ALLOWNOTE' parameter
* Updated recurring payments profile documentation and examples

* Added 'no_shipping' option to payment options, which allows disabling shipping fields in Paypal payment form

* Added recurring payments support - using Express Checkout and Direct Payment
* Added refund method support